Melva's hands were trembling out of her will as she raised her bow and aimed her arrow at Vance. She had no choice but to harm him now that he had lost control of himself. She was determined to put him out of his misery by knocking him out cold and bringing him back home where they could treat his condition, finding out what Mervin had done with him.
If she was lucky, she could harm him enough to force him to shift back into his human form. There was so much anger while they were being their wolves. It would be more difficult to bring them back to their senses in that state.
The snarling white wolf in front of her was not Vance. Mervin had done something to make Vance's wolf side take over his sane mind entirely, causing him to go berserk. She convinced herself that the white wolf before her was just a wild wolf. It was not Vance.